From a0fb00f9837bd0d2e5948f16f6a6b82a7a628f51 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Sat, 26 Feb 2011 22:09:03 +0000
Subject: Vendor import of clang trunk r126547:
 http://llvm.org/svn/llvm-project/cfe/trunk@126547

---
 lib/AST/DeclBase.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'lib/AST/DeclBase.cpp')

diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index be379d5..81df00d 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -465,6 +465,22 @@ void Decl::CheckAccessDeclContext() const {
 #endif
 }
 
+DeclContext *Decl::getNonClosureContext() {
+  DeclContext *DC = getDeclContext();
+
+  // This is basically "while (DC->isClosure()) DC = DC->getParent();"
+  // except that it's significantly more efficient to cast to a known
+  // decl type and call getDeclContext() than to call getParent().
+  do {
+    if (isa<BlockDecl>(DC)) {
+      DC = cast<BlockDecl>(DC)->getDeclContext();
+      continue;
+    }
+  } while (false);
+
+  assert(!DC->isClosure());
+  return DC;
+}
 
 //===----------------------------------------------------------------------===//
 // DeclContext Implementation
-- 
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